After five men previously acquitted of various criminal charges are murdered by a mysterious avenger known as Dr. Rx, police Inspector Hurd (Edmund MacDonald) and Sergeant Sweeney (Shemp Howard) ask private investigator Jerry Church (Patric Knowles) to help them on the case. He takes the case after talking to Dudley Crispin (Samuel S. Hinds), a brilliant attorney who had defend...
A scientist working on an important new invention which will protect Allied shipping from U-boat torpedoes has been assigned Secret Service security protection. Amazingly, despite the fact that his laboratory and experiments are located on the upper floor of his Washington mansion, he decides to host a cocktail party for friends on the first floor. Even though several of his gu...
Thomas P. Manning, businessman and chess expert, mysteriously shot in a locked room, dies clutching some chess pieces. Police are baffled, and finally abandon the case. Six months later, victim's daughter Leah Manning, stung by a scurrilous book about the case, enlists the aid of Charlie Chan and Number 3 Son. Additional murders follow, leading to a climactic confrontation in a...
